Scientific Papers Series Management, Economic Engineering in Agriculture and Rural Development Vol. 20, Issue 1, 2020 PRINT ISSN 2284-7995, E-ISSN 2285-3952 533 YIELD POTENTIAL AND STABILITY OF SOME SPRING BARLEY VARIETIES AND LINES Florin Marian RUSSU 1 , Ioana PORUMB 1 , Camelia Ancuța URDA 1 , Emanuela FILIP 1,2 , Cristina STANCĂ-MOISE 3 , Adina VARADI 1,2 , Liliana VASILESCU 4 , Eugen PETCU 4 1 Agricultural Research and Development Station A.R.D.S Turda, Romania, Emails: florin.russu@scdaturda.ro, ioanaporumb18@yahoo.com, cami1586@yahoo.com 2 University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca, Romania, Emails: emanuelafilip33@gmail.com, adina_presecan@yahoo.com 3 University "Lucian Blaga" of Sibiu, Email: cristinamoise1@yahoo.com 4 National Agricultural Research Development Institute Fundulea, Emails: liliana@ricic.ro, eugen_petcu12@yahoo.com Corresponding author: ioanaporumb18@yahoo.com Abstract The experimental results were processed according to the polyfactorial experiences of type A x B x C where: A- was represented by the factor of locations with two graduations (Turda and Fundulea), B was the factor of year with three graduations (2016, 2017 and 2018) and C- factor genotypes with 25 graduations. Lines To 2027/10, To 2208/02 and the reselection of the Jubileu variety, are particularly noticeable in terms of average yield with relative increases compared to the control of 10, 9 and 5% respectively. The variation of the absolute productions was between 3683 kg/ha and 4862 kg/ha in Turda conditions and between 3265 kg/ha and 4143 kg/ha in Fundulea conditions. Following the use of the method proposed by Francis and Kannenberg (1978), the lines To 2027/10, To 2208/20, To 2167/01, To 2054/97, To 2095/01 and To 2013/99) which have a coefficient of variation below the average value and high output above average have proved to be production stable. Key words: spring barley, genotype, yield, stability, location INTRODUCTION In our country, the spring barley meets very favourable conditions of culture in a quite restricted area (Bârsei Country, Sfântul Gheorghe and Târgul Secuiesc, Someșului Valley, Aries Valley, Mureş Valley, Criş Valley and the sub-Carpathian area of Moldova) a humid and cool climate. The dry and semi-dry areas of the country as well as the areas with light sandy soils are unfit for the culture of barley. In these less favourable areas, the production of barley is affected both quantitatively and qualitatively, an aspect which refers in particular to barley for beer. The most important quantitative reductions in barley yield occur when the grain filling phenomena occur longer periods with high temperatures, as a result of soil drought, reducing the period of accumulation of carbohydrates in grain, very common phenomena in most areas of the country [6]. The humid and cool climates positively mark the quality of barley for beer, as it favours the accumulation of starch in detriment of proteins [2, 3]. Yield capacity is determined by internal factors (genetic) and external factors (environmental conditions). According to Ceapoiu (1984), 56% of the total variance of a variety's production is affected by external conditions. This implies that 40-50% of the total variance would be genetically determined [1]. In some cases, the intrinsic genetic contribution to increasing production capacity has been associated with improved resistance to disease, fall or unfavourable environmental conditions. To prove their genetic contribution in this regard [7] performed an experiment with old and new varieties of wheat, which created artificial conditions for disease and fall prevention. Under these conditions, the production of new varieties exceeded the old varieties by about 2 tonnes per hectare, both at a high fertilisation level and at a reduced nitrogen fertilisation. In determining the value of a cultivar, in addition to the yield potential, an important weight must have the stability of production. The lack of this trait can make a variety valuable only under certain, very specific